using and similar idea of shelling but with object shell

[Anonymous]

i am trying to effectively shell a shape out with another if makes sense its been a while since i have used 123d design and i believe these are basically the same thing. i remember doing it with on that but not sure how i did it 

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Not sure what you are looking for, but it somehow sounds like a boolean operation. That's done with the Modify -> Combine tool.

[Anonymous]

Yes this somewhat worked but how do I then delete the shoe its created in my rectangles

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Uncheck the "Keep Tools" option.